For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:pbiel/openSUSE_Tumbleweed/home:pbiel.repo
zypper refresh
zypper install enter-tex
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:pbiel/openSUSE_Slowroll/home:pbiel.repo
zypper refresh
zypper install enter-tex
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:pbiel/16.0/home:pbiel.repo
zypper refresh
zypper install enter-tex